An ultrasonic treatment system includes a calculator calculating a relation between an amplitude of a vibrating body unit when an ultrasonic vibration is generated and an electric current to be supplied to an ultrasonic generator based on both an elapse of time and a number of thermal processes. The ultrasonic treatment system includes a current value setting section setting the electric current to an adaptive current value that brings the amplitude of the vibrating body unit to a target amplitude based on the relation between the amplitude of the vibrating body unit and the electric current calculated by the calculation section.
